Lock



c. Lil-:DIN

LOCK NOV. 1,

Filed Aug. 14, 1923 Patented Nov. 11, 1924.

UNITED ,FFICE.

CHARLES LEDIN, 0F STAMFORD, CONNECTICUT, ASSIGNOB TO THE YALE & TOWNE MANUFACTURING COMPANY, OF STAMFORD, CONNECTICUT.

LOCK.

Application filed August 14, 1923. Serial No. 657,276.

To all whom it may concern: v

Be it known that I, CHARLES LEDIN, a citizen of the United States, and a resident of Stamford, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in locks and more particularly to blocking means for the bolt operating cam of a cylinder lock applied to the back cover plate of a rim lock,one object of the invention being to provide spring-actuated means adapted to become disposed in the path of thebolt operated cam in the event of the unauthorized loosening of one of the bolts which secure the cylinder in place.

With this object in view the invention consists in certain novel features of construction as hereinafter set forth and pointed out in the claims.

In the accompanying drawings,

Figure l is a face view of a cover plate for a rim lock showing an application of my invention, and

Figure 2 is a sectional view of the same.

In the embodiment of the invention shown in the drawing 1 represents a sheet metal back or cover plate for the casing of a rim lock and has mounted therein, a roll back 2 with which a roll back or bolt operating cam 23 is suitably connected. The cover plate is provided in proximity to the mounting of the roll back cam with holes 4-. through which two or more bolts may be passed for securing a cylinder lock in place.

The metal of the face plate is offset as at 5 and this offset portion provided with one of the bolt holes l and this bolt hole is sufliciently large to accommodate a bushing .6 through which'the bolt 7 passes. The bushing 6 is made at one end with a flange 8 to rest against the enlargement 5 when the parts are in the position shown in Figure 2 and the other end portion of said bushing is enlarged as at 9 and provides a seat 10 for the head 11 of bolt 7. A spring 12 is housed within the enlargement 5 and bears respectively against one end of said enlargement and the enlarged portion 9of the bushing,

said spring tending to move the bushing to the position shown in Figure 2 so that it will project into the path of movement of the bolt operating cam 3. hen the cylinder lock is secured in place, the head 11 of the bolt 7 will seat within the bushing, at 10, and move said bushing against the resistance of the spring 12 so that it will be out of the path of movement of the cam 3.

With my improvements, should an attempt be made to wrench the cylinder from the door, the bolt 7 would become loosened and move lengthwise sufiiciently to permit the spring 12 to project the bushing 6 into the path of the bolt operating cam 3 and prevent the latter from making an effective throw to operate the bolt.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is:

1. The combination with a back or cover plate for a rim lock having a hole for the accommodation of a securing bolt and a bolt operating cam mounted in said cover plate, of a spring actuated blocking device for said bolt operating cam mounted in the cover plate and normally tending to move into the path of the bolt operating cam, and a securing bolt for a cylinder lock normally holding said locking device out of the path of movement. of said cam.

2. The combination with a back or cover plate for a rim lock having a hole for the accommodation of a securing bolt for a cyl-.

inder lock and a bolt operating cam mounted in said cover plate, of a spring actuated bushing passing through said cover plate, and a securing bolt for a cylinder lock passing through said bushing and having a head to seat therein, said spring actuated bushing constituting locking means for the bolt operating cam and said bolt normally operable when the cylinder lock is in place to hold said bushing out of the path of movement or" the bolt operating cam.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

CHARLES LEDIN. Witnesses:

CHARLES A. BERRY, FRANK D. SLOAT. 

